Screened pump



April 13, 1948. R. H. HOPKINS SCREENED PUMP Filed Feb; 20, 1946 Iuverltor nen.-

Patented Apr. 13, 1948 UNITED STATES PATENT OFFICE Roy H. Hopkins,Alice, Tex.

Application February 29, 1946, Serial No. 648,984

My invention relates to improvements in hydraulic pumps, particularlythose used for dipping oil or water from subterranean levels. Inconventional pumps of this character certain precautions are taken toexclude undesirable `sand particles from such liquids, such assurrounding the pump by a screened jacket through which the liquid isdrawn and by providing a sediment chamber in the base of the pump intowhich the sand particles may gravitate.

However, such methods are frequently inadequate and the sand usuallyfinds its way into the mechanism of the pump and by its abrasive actioncauses premature wear and undue failure of the same. Frequently, thesand also obstructs the movement of the pump plunger whereupon thelatter must be withdrawn for cleaning, thus causing inconvenient delaysin operation.

It is therefore the principal object of my in' vention to provide ascreen pump in which the mechanism is protected from said sand particlesin such manner, that the above stated defects now in existence will beeliminated.

A further object of the invention is to provide a screened pump which isreadily accessible for the removal of sand which has been separated bythe screen.

A further object of the invention is to provide a screened pump in whichthe screening element is easily applicable to existing pumps now in usewithout such improvement.

With the above more important objects in view and such other objects asmay become apparent as this specication proceeds, my invention consistsessentially of the arrangement and construction of parts as illustratedin the accompanying drawings in which:

Figure 1 is a longitudinal elevation showing the assembly of myinvention, the same being partially broken away to reveal itsconstruction,

Figure 2 is a detail showing the upper portion of Figure 1 inlongitudinal cross-section,

Figure 3 illustrates my screening element,

Figure 4 the crosssectional View taken along the line 4-4 of Figure 3,and

Figure 5 is a perspective View showing a bottom collar used in theassembly illustrated in Figure l.

Referring now to the accompanying drawings in detail, my inventionconsists of a perforated cylindrical shell I, formed from a length ofconventional oil or water screened pipe and having the ends thereofinternally threaded to receive the top collar 2 and the bottom collar 3.A suitable pipe 4 is screwed into the upper end of collar 2 and extendsto the ground surface.

2. Claims. (Cl. S-179) A cylindrical liner 5 containing the pumpmechanism hereinafter more particularly described, extends betweenthelimits of the arrows E-B indicated in Figures 1 and 2,.and is rmlyclamped in position between the chamfered upper edge l of the collar 3and an internal shoulder 8 formed in the bore of the collar 2. The liner5 is concentrically disposed with respect to the shell I and isseparated therefrom to form an annular chamber 9.

The aforementioned pump mechanism comprises a plunger rod I0 to which isimparted a reciprocating movement by any suitable machinery on theground surface. Rod I 0 is connected to a top'cage I I containing a balland seat I2, the latter being externally threaded to receive the upperend of the plunger I3.

lIvhe plunger is slidable in a pistonlike manner inside the bore of theliner 5 and carries at the lower end thereof an extension I4 commonlyknown as the garbutt rod. This extension is provided at its upper endwith an enlarged head I4 and is threaded medially of its length toaccommodate a nut I5, together with a lockwasher I6.

The lower end of the rod I4 in turn, carries a lower cage Il containinga further ball and seat I8, whereupon a cylindrical adapter I9 commonlyknown as the standing valve body is screwed into the lower end of thecage Il. V

It will be noted that the bottom collar 3 is provided with a pluralityof radially extending apertures 20 whereby the liquid entering thechamber 9 through the perforated shell I may pass into the adapter I9and to the associated pump mechanism. The essence of my inventionconsists of a, tubular sediment jacket 2| closed at the lower end 22thereof and being suitably threaded at the upper end 23 into the lowerend of the collar 3. The latter is internally threaded near its upperend as at 24 to accommodate an externally threaded shoulder 25 of thescreen casing 2B. The casing is of a cylindrical configuration closed atthe lower end 21 thereof and employs a wire gauze of suitable mesh forits lateral side 28. It is designed to envelop the adapter I9substantially as shown in the accompanying drawings and extendspartially into the jacket 2l, leaving a sediment chamber 29 at thebottom thereof.

When my invention is placed in operation, the liquid entering thechamber 9 through the perforated shell I will be strained thereby as inconventional practice and the coarser particles of sand eliminatedtherefrom. 'Ihe liquid will then pass through the apertures 20 of thecollar 3 and drained into my sediment jacket 2l, but

prior to entering the adapter I9 and the associated pump mechanism itwill pass throughmy screen casing 26. This being of liner mesh than theperforations in the shell l Will exclude the smaller particles of sandwhich were formerly allowed to enter into the pump. The advantages of myinvention are thus clearly apparent. The sand accumulating in thesediment jacket 2l may easily be removed therefrom by unscrewing thesame from the collar 3.

It will be observed that the extension I4 will facilitate freereciprocation of the plunger l5 While pumping. However, when the pumpmechanism is being disassembled for cleaning or other purposes, the headI4' will pull the extension lil and the associated elements l1 and I9from the shoulder 25, as the plunger is withdrawn from Y jacket and atubular screen casing secured to one of said collars, said casingcommunicating with said pump plunger and valve mechanism and extendinginto said jacket, and said jacket communicating with said chamberthrough a plurality of apertures formed in said collars.

ROY H. HOPKINS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,045,282 Hahn Nov. `26, 19121,347,806 Fender ---l July 27, 1920 1,578,720 Derby Mar. 30, 19261,751,017 Sullivan Y Mar. 18, 1930 2,178,822 Upton et Val Nov. 7., 1939

